Recommended 8/34

Sure grip units will interchange across the 8-3/4s so you can swap one of the others into your 741 housing. If you are planning to do much on slicks you probably better figure on either the 742 or 489. If only an occasional blast on slicks you may get by on the 741. (Some people make them last for a lot of 1/4 mile passes with no problem but you know the old saying, better safe than sorry...) 4spd or auto will also make a difference... As previously mentioned, gear sets are readily available for the 742 or 489 and the bearing sets are all "approximately" the same price. So the net difference you would have in 742 or 489 vs 741 would be a couple hundred bucks for a higher ratio gear set. It would depend on how much abuse you actually plan to subject on the assembly .